To the chandler



(No Model.)

I. A. BURNHAM. MEANS FOR SECURING GHASES IN PLATEN PRINTING PRESSES.

Patented Jan 25, 1.898.

UNITED STATES PATENT muons FRANK A. BURNI-IAM, OF CLEVELAND, OHlO ASslGNoR TO THE CHANDLER 85 PRICE COMPANY, OF SAME PLACE.

MEANS FOR SECURING CHASES IN PLATEN PRINTING PRESSES.

SPECIFICATION forming part of Letters I'atent No. 597,928, dated January 25, 1898.

Applicationfiled July 22, 1897- $eria1No. 645,552. (No model.)

To all whom it may concern.-

Be it known that I, FRANK A. BURNHAM, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Means for Securing Chases in Platen Printing-Presses; and I do declare that the following is a full, clear, and exact description of the invention, suchas will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to means for securing a chase in a platen printing-press; and the inventionconsists in the construction, combination, and arrangement of parts, substantially as shown and described, and particularly pointed out in the claims. It is well known that in presses of this kind in a job ofiice the forms are liable to change very many times a day, and hence it is desirable that the means which the pressman has to handle for fastening or holding the chase in position should be not only efficient in themselves, but convenient in location and easily manipulated.

In the accompanying drawings, Figure 1 is a vertical sectional elevation of a bed of a printing-press and a section of a chase and an elevation of securing mechanism therefor, taken on a line'corresponding to 1 1, Fig. 2. Fig. 2 is a plan View of the operative parts shown in I ig. l.

A represents the bed of a printing-press, constructed in any usual or acceptable form and provided at its front and lower edge with lugs 2, constructed to engage and support the chase B. The, chase, as is now comm on, is provided with beveled top and bottom edges, and the lugs 2, being correspondingly but reversely beveled, are adapted to make a firm support for the chase at its bottom.

Now in order that the chase may be locked and held in such a way that it will be firm and secure all around and easily and quickly removed and replaced I have devised a simple mechanism for holding it in place, the same consisting of a short rock-shaft on the top and rear of the bed A, supported in bearingdugs 2 thereon, and on this shaft I fix rigidly a beveled hook E, adapted to reach forward and engage over the top edge of the chase. Then in order that said hook may be both held in and out of engaging position and be easily rotatable in or out of such position when the chase is to be removed I form the head 3 of the hook with two fiat surfaces aand b on its lower side, where it is engaged by the flat head of a bolt F on either surface, according to the position of the hook.

The bolt F is shown here as projecting through the usual flanges or webbing on the back of bed A, in which it is adapted to slide, subject to pressure by coiled spring G, which is wound about said bolt and bears at one end against the webbing 4t and at the other end against a cross-pin in the bolt F, thus keeping said bolt normally projected to press against the head of hook E. The spring G is stifi and strong and exerts all the pressure needed against the heel of the head 3 to keep hook E in close engagement with the chase B. Thus the lugs 2 hold the chase along one edge and the hook E along the other edge, said hook coming at about the middle of the top of the chase, as shown in Fig. 2.

The hook-shaft C is provided with an upwardly-projecting finger or short arm 11 in convenient position to be reached by the pressman to rotate said shaft by comparatively slight pressure to unlock hook E and disengage the chase, the bolt F being depressed in this operation against spring G.

All of the foregoing mechanism is within the contour of the bed A, so as not to be in the way of other parts of the machine and in the most convenient position possible for reach by the pressman.

What I claim is-- 1. The bed of a printing-press, a rotatable shaft along the upper edge of the bed at the rear thereof, a hook on said shaft to engage and hold the chase on the bed, a springpressed bolt 'to engage the head of the hook and hold the hook in or out of working posi tion, and a projection on said shaft to be engaged by the hand of the operator and rotate the shaft, substantially as described. 2. The bed having engaging lugs at its bottom and the chase resting on said lugs, a rotatable shaft supported horizontally on the back of the bed and carrying a hook, said hook having flat bearing-surfaces on its head,

a bolt to bear against the head of the hook to keep it in engagement or disengagement 10 and a spring pressing upon said bolt, substantially as described.

Witness my hand to the foregoing specification this 8th day of July, 1897. v

FRANK A. BURNHAM. Witnesses: H. T. FISHER, R. B. Mosnn. 

